At the suggestion of @Timothy Hatcher, we should slightly increase the horizontal scope bar items so that they feel less constrained and more evenly spaced/rounded.
Created attachment 389927 [details] Patch
Comment on attachment 389927 [details] Patch Clearing flags on attachment: 389927 Committed r255894: <https://trac.webkit.org/changeset/255894>
All reviewed patches have been landed. Closing bug.
<rdar://problem/59211565>